[altair]

The winner this year averaged about 5.5 miles per hour.

That's rather impressive. May I presume, like the Iditarod that racers have to carry their own supplies?

[deport]

May I presume, like the Iditarod that racers have to carry their own supplies?

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No the runner is required to have at least one 4 wheeled support vehicle with at least two people as crew. They can have a maximum of two support vehicles and six crew members.

http://www.badwater.com/rules.html